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19.2 Pathnames    19.2.2 Interpreting Pathname Component Values    19.2.2.4 Restrictions on Examining Pathname Components    19.2.2.4.3 Restrictions on Examining a Pathname Directory Component
19.2.2.4.3.1   Directory Components in Non-Hierarchical File Systems
In non-hierarchical file systems,
the only valid list values for the directory component of a pathname
are (:absolute string) and (:absolute :wild).
:relative directories and the keywords
:wild-inferiors, :up, and :back are not used 
in non-hierarchical file systems.
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